pass query warnings around in cluster
fixed issue when rolling back remove operations that could not remove from indexes
re-activated tests
fixed typos
control number of v8 contexts independently from number of server threads

added command-line option `--javascript.v8-contexts` to control the number of
V8 contexts created in arangod.

Previously, the number of V8 contexts was equal to the number of server threads
(as specified by option `--server.threads`). However, it may be sensible to
create different amounts of threads and V8 contexts. If the option is not
specified, the number of V8 contexts created will be equal to the number of
server threads. Thus no change in configuration is required to keep the old
behavior.
documentation fixes
fixed cloning of AST nodes
minor cosmetics
Merge branch 'devel' of github.com:triAGENS/ArangoDB into devel
Merge branch 'devel' of ssh://github.com/triAGENS/ArangoDB into aql-feature-optimize-or
Jan's patch
snapshot
cleaning up
bugfix
adding tests
Fix possible uninitialised variable access as advised by Frank.
All headlines in the documentation will be shown correctly now
updated documentation
updated docs
Headlines now show everything in the right size