Some string functions are now documented in l3str 'proper'


git-svn-id: http://www.latex-project.org/svnroot/experimental/trunk@5417 de43f980-851b-0410-b2f7-c40aca1f87e0
l3build: Add a switch for TDS building

Is the variable name OK here? Do we need more detailed documentation on
this?

I hope this approach keeps everyone reasonably happy: TDS zip files available
for those who want to build them but as an 'opt-in'.


git-svn-id: http://www.latex-project.org/svnroot/experimental/trunk@5418 de43f980-851b-0410-b2f7-c40aca1f87e0