Initial commit for weaver.

From:

https://bitbucket.org/pbui/weaver

at commit:

37a9720
Fix installation paths and add docs.

Conflicts:
	configure
Python from env
Bug fix hyphen in filenames
Fix test examples
SYMBOL to CATEGORY
Remove build directory.
Add python 2.6 as an option
Remove -f, add -W to stop on warnings
Copy weaver examples to doc/
Merge branch 'cctools_weaver_rel' into release/4.3