add TS-2082
TS-2082: remove FIXME_NONMODULAR defines
TS-548: remove Initialize.cc Initialize.h
add TS-2386
Bump sphinx docs version to match autoconf
Fixed a bunch of misspelled words in comments
TS-2077 Remove proxy.config.http.user_agent_pipeline remnants
TS-2077 Remove proxy.config.http.origin_server_pipeline
TS-2077 Added to CHANGES.
update regex remap docs
Document the remap.config '.include' directive
doc: fix various sphinx syntax errors
TS-2426: add the xdebug plugin

The xdebug plugin scans X-Debug header values and emits the requested
debug information. The plugin is named after the X- prefix of the
headers that is scans and emits.

The values we scan for are names of debug headers. The first header
to be supported is X-Cache-Key, which report the cache lookup URL
used buy the request. the second header supported is the Via header,
which causes a verbose Via header to be emitted for the request.
TS-2426: document the xdebug plugin
TS-2426: add xdebug plugin Makefile.am
TS-312: s/sever/server/
TS-2424: make g_diags private to RecDebug.cc
TS-2424: set diags log file for each caller

Since DiagsConfig.cc is built into a static library, we can't rely
on the preprocessor to determine what the diagnostic log file should
be. Add a filename to the constructor so that each usage uses an
explicit name.
TS-2424: document diagnostic logging configuration
TS-2426: fix unused variable warnings