multi constraints and rhs variables
moved rhs setting outside of Rglpk_solve
very basic test for GLPK
added rhs import for multi problem
added multi rhs support
fixed bug of set_rhs. modifed test-glpk.r to test that
Merge pull request #1 from jaak-s/master

Create README.md
comments to the input of solver
fetch status and objective value of multi problems
second test
checks for input of the multi problem constraints
added .swp files to gitignore
multi problem optim. now can handle multi RHS
fixed int rounding error, added more tests
implemented multi optimization constraints.
added tests.
checking bounds of mmat_i
testing of full multi optimization
changed R method to multi_glpk_solve_LP.
changed C method to multi_glp_solve.
dea.input now uses multi optimization code
updated comment