documentation updtes
Merge documentation updates from feature-llvm

git-svn-id: https://roadrunnerlib.googlecode.com/svn/branches/develop@1097 c0027639-9190-0b57-01eb-f09a03790dae
added documentation, added const correctness and setup LibStruct so we don't have to re-parse sbml, fixed bug in currently unused code branch of lmcurve

git-svn-id: https://roadrunnerlib.googlecode.com/svn/branches/develop@1103 c0027639-9190-0b57-01eb-f09a03790dae
merge changes from develop

git-svn-id: https://roadrunnerlib.googlecode.com/svn/branches/feature-llvm@1104 c0027639-9190-0b57-01eb-f09a03790dae