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.

      - Collector #278: DocumentWithImages could not handle URLs with
        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)