Debugging for removing the locks in calling pattern matcher.
Guile unit test: put the sequence of tests into order.
atomspace: fix broken operator<<()
scheme: Fix output port drain
Guile: provide documentation for the new code.
Merge pull request #1024 from linas/bugfix

Bugfix for #1023
Merge branch 'master' of http://github.com/opencog/opencog into PM
Removed a lock , raised the speed of mining
Possible race fix for bug #1025
Add a sanity check for multi-atom-table atom removal.
atomspace: clone atoms that belong to other atomspaces.
atomtable: clone the outgoing set too, if cloning needed
Merge pull request #1026 from linas/racey

Possible bug fixes for issue #1025
Atom extraction: add another sanity check.
Merge pull request #1027 from linas/r2

Atom extraction: add another sanity check.
Start work on nested AtomSpaces
AtomTable: more of the environment implementation.
Allow Hierarchical AtomSpaceImpl's
AtomSpace: Remove some strange old cruft.
Merge pull request #1028 from linas/hier

Add support for multiple hierarchical atomspaces