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New Features: Added plot variable for plastic yield stress, updated nonlinear iterative solution method for reactive plasticity to produce better results for yield criterion Deshpande-Fleck Added plot variables for the Drucker shear stress, the Drucker-Prager stress criterion, and the Deshpande-Fleck stress criterion Added Deshpande-Fleck yield/damage criterion Added Drucker-Prager failure or yield criterion. Fixed factor of 2 error in tens4dmm::dyad4 calculation Added support for "const" ElementData section. Added pipette aspiration pressure load Added support for reading and writing xml encode control characters. Added support for MAT3F element data in VTK export. Added support for FMT_MULT domain variables to VTK export. These fields are stored as nodal data. Added "incremental displacement" plot variable that calculates the change in displacement from the previously stored state. Implemented fiber-pow fiber material model. Implemented fftw-based image blurring algorithm. FEBio no longer requires a config file to run. Config files must now be explicitly added to the command line (use -config). Implemented active contraction model valid for uncoupled materials. Improvements: Added body force stiffness calculation for beam domains. Updated Deshpande-Fleck yield criterion to be more consistent with the paper. Modified parameterization of FEEllipsoidalFiberDensityDistribution to simplify assigning maps. Added option to stiffness diagnostic to only test a limited number of equations. Initialized "spa" member of the "ellipsoidal" density distribution to a valid value. Some minor changes to continuous fiber framework to simplify some plugin development. Added error message when rve fails to load. Modified sign convention in "rigid joint" to be consistent with other rigid connectors. The invalid command line option is now reported to the user. Allowed some whitespace in the tag's value when defining maps. Bug Fixes: Fixed bug in FEBioMech/FEBioMechModule.cpp Fixed method for evaluating isobaric specific heat capacity in real liquids, gases and vapors Fixed minor bug to allow gap tolerance to be specified for AUGLAG in sliding-elastic, even when tol=0 Fixed crash in export of "PK1 norm" plot variable. (#111) Fixed bug in writing mat3 data to vtk file. Fixed bug in serialization of FEReaction. Fixed issue with order of serializing data. Fixed bug where nodeset was not set for nodedata generators. Fixed issue in elasticity calculation in several materials. Fixed several issues with stiffness matrices of rigid connectors. Also implemented Lagrange Multiplier method for all rigid connectors. Alpha parameters are now only set in dynamic analyses. This fixes a bug where alpha parameters affected static analyses too. Fixed problems when running micro-materials. Fixed issues with stiffness matrix of "rigid joint". Fixed issue with Gaussian filter in fftw blur. The "import" plugin folder in config file is now supported on all OSes. Fixed stiffness matrix for rigid connectors. [skip ci] Stiffness matrix now handles rigid nodes correctly. Fixed unit assignments in muscle material parameter list. Documentation: Description of FEBio tasks was added (section 2.10). The tables of plot and log variables were expanded and are now available in Appendix E. Many missing boundary conditions, initial conditions, and loads were added to the documentation. Descriptions of several domain types were updated. Documentation on FEBio's explicit solver was added to section 3.3.9. Added documentation for Deshpande-Fleck damage/yield criterion Added description of pipette aspiration pressure load. Fixed reference in active contraction material in theory manual. Updated description of time stepper in user manual. Fixed documentation of fibers-3d-fei integration rule. Updated developer's manual. Fixed some typos in the material plugin section and added a new section on creating plugins with fbs3. Updated user manual to correct numbering error for reactive viscoelastic trigger (should be 0, 1, 2 not 1, 2, 3)