cctools weaver integration

Some installation fixes.
Changed -f to -W (force is true by default now).
Changed -l to -o for log output, to conform with rest of cctools
Changed -o to -O for stash output.
Added documentation (weaver examples are now copied to
INSTALL_PREFIX/cctools/doc)
Merge pull request #586 from btovar/cctools_weaver

cctools weaver