1. Fixes a bug in the TM whereby tpc_abort was ignored. this
     was the likely cause of external transaction manager's never
     recieving a commit or abort statement and hanging because
     they could never register again for a transaction.

  2. Works around a bug in Zope's transaction machinery. This
     bug is a corner case. it would cause loss of data integrity
     if a external transaction manager were involved in a
     zope transaction that involved a subtransaction commit, in
     which the overall transaction was aborted.

merged toby-permission-table-headers-branch: Collector 274: nicer formatting for tall permissions table

        provide a more intuitive traceback for operating systems with a
        limited gmtime() implementations

merged toby-syslog-access-branch: Collector 271: use different environment variables for sending event log and access log to syslog

has been started without webdav server

Fix SF bug #516768 reported by Dave Wallace.

Replace use of PyMem_DEL() with PyObject_Del() on object dealloc
functions.  The use of PyMem_DEL() is incorrect for object
deallocation, because it only ever calls the low-level free().  If a
custom allocator like pymalloc is used, it needs to be called to free
the memory.

        underscores

for dedicated webdav clients by setting the env. var
WEBDAV_SOURCE_PORT_CLIENTS

- unified output for inner links

- minor code cleanup (striping of unused spaces)