Add PatternMatch::single_bindlink to find first match and then stop
Add unit test for PatternMatch::single_bindlink
Add a new load-relative utility
cython to use relative path loader
Use only a single module-loading search path.
Compile fix, if no scheme installed.
Add explicit build dependencies

Because CMake doesn't know how to peer into the guts of
cython pyx and pxd files, and so doesn't know when to rebuild.
Move the default module patsh to util directory
Merge pull request #748 from linas/load

Fix python module load search paths
oops -- multiple errors in previous commit
Merge pull request #742 from cosmoharrigan/bind-one

Provide a SingleImplicator interface for the pattern matcher that finds one result and then stops
Add priority-ordered search to pattern matcher.

Search can be truncated or prioritized with this new callback.
Merge pull request #749 from linas/prio

Add priority-ordered search to pattern matcher.
Fix compiler warnings
fix wonky whitespace