* modified "Init" constraint to enable specification of 2 initial conditions (for Newmark): two values can now be specified using "Value[ expr1, expr2 ]". (Warning: this changes the format of the .pre file.)

* added InitSolution1 operation in resolution to initialise the solution at the oldest time-step (expr1)

* added "-gmshread file(s)" command line option to enable loading Gmsh datasets directly from the command line; this way the datasets can be used in the pre-processing phase... e.g. to impose initial conditions