Allow retrieving a specific program from a Project

Also change MatlabProgram.getPath() to return a java.nio.Path instead
of a String.
Add MatlabProgram helper that creates Project.
Add a transformer to RefactoringContext.
Eliminate some duplication in McLint tests.
Fix bug in MatlabProgram.at.
Add MatlabProgram.getAbsolutePath()
Eliminate duplication in pretty printer.
Change made to method call containing matrix operations to library function calls.
Wrapper generator almost complete . Testing left.
Merge branch 'develop' of https://github.com/Sable/mclab into develop
vtypeMatrix has a toXML method which allows you to get just a scalar code of the xml. Useful for constant expressions.
Merge from 'develop'