updated ModelData for sparse stoichiometry storage, update rrCompiler flags for older gcc

git-svn-id: https://roadrunnerlib.googlecode.com/svn/branches/feature-llvm@1264 c0027639-9190-0b57-01eb-f09a03790dae
Merge branch 'gdevelop' into gfeature-llvm

git-svn-id: https://roadrunnerlib.googlecode.com/svn/branches/feature-llvm@1265 c0027639-9190-0b57-01eb-f09a03790dae
added sparse stoichiometry matrix

git-svn-id: https://roadrunnerlib.googlecode.com/svn/branches/feature-llvm@1266 c0027639-9190-0b57-01eb-f09a03790dae
add sparse stoichiometry matrix

git-svn-id: https://roadrunnerlib.googlecode.com/svn/branches/develop@1267 c0027639-9190-0b57-01eb-f09a03790dae