fix build break when atomspace is not being built

It can happen that atomspace is not built ...
Fix build breaks if python is not installed.

Yes, it can happen ...
Hush non-standard error message.
Fix build break that obtains with gcc-4.7, 4.8
Fix compiler warning
Remove some crazy library dependencies
Merge pull request #1081 from linas/die

fix assorted build breaks that new users might trip over.
enforce all links to be matched
Check if a block is inside the boundary of the map before add it into the space map.
Merge pull request #1086 from shujingke/FixingSpaceMap

Check if a block is inside the boundary of the map before add it into th...
Add simple Cython atomspace benchmark for comparison
Update number of iterations in example
Merge pull request #1087 from cosmoharrigan/cython

Add simple Cython atomspace benchmark for comparison
added basic ranking return value
Merge pull request #1085 from williampma/SuRealEdit

SuReal: added weights to indicate how many links matched/not matched
Simplify with C++11 loop style
Improve comment of PAI::addAction (add hypergraph structure)