Changes in buckling analysis results output

Jorge

changes in rigidpendulum input

… analytical solution.

changes in truss bending spring loads and in LBA computation

…o make input with a .dxf file

update branch

update development

update version

…VonMises added.

update changes in input files

update

… separated in manual and gmsh methods

…lder

a few changes in input/example files

…ynamic von mises example for validation

changes in stopping criteria // changes in plots // HHT included as Method 4

global changes and simplifications

…omputation of viscous and inertial forces and tangent matrices

changes in assembler functions and updates in examples

update branch

… angular variables

…w files

…elembeamforces function

errors fixed in beam mass functions

…bility solved

Matlab and Windows compatibility improvement