Fix double-escaped forward slashes.

Probably due to copy'n'pasting from python code.
Fix typo in README.markdown

Noticed when reviewing recent comment by jrfonscea in issue #199
referencing "Emitting annotations to the trace" in README.markdown

Signed-off-by: Lawrence L Love <lawrencex.l.love@intel.com>
gui: Never filter glPushDebugGroup.

Or everything inside will be invariably filtered out.

Thanks to Michal Krol to point this out.
gui: Don't show glPopDebugGroup().
glretrace: Ignore application messages while dumping state.
fix for glMultiDrawElementsIndirect
Flag more draw calls.
glstate: Dump sampler parameters up to MAX_COMBINED_TEXTURE_IMAGE_UNITS.

And not just up to MAX_TEXTURE_COORDS, which is zero on core profile
contexts.

Thanks to Min-Yu Huang for pointing this out.
Flag wglGet|DescribePixelFormat calls as verbose.
Move format description to its own document.

Hoping it may make the format more appealing to other tools, and because
I plan to introduce some changes.
cli: Simplify tracing with gdb.
egltrace: Improve spec of EGL context attributes.
egltrace: Retry without EGL_CONTEXT_OPENGL_DEBUG_BIT_KHR.

Seems to be causing problems with Mesa EGL drivers.
glxtrace: Use dlsym protection only on wrappers.

Similar in spirit to the Lawrence Love's pull request #203, but instead
of building multiple variants of glproc_gl.cpp simply move the
dlsym protection code into wrappers dir.
egltrace: A few more tweaks to the spec.
glretrace: Don't attempt to replay failed glX* calls.

This is particularly important when application attempts
glXCreateContextAttribsARB with different profiles, as described in
http://lists.freedesktop.org/archives/apitrace/2014-May/000950.html

This change is just a first stab.  There are more glX* calls (and
cgl*/wgl* calls too) that need to be updates accordingly.
glws_glx: Set our own error handler.

So that we don't terminate on non-fatal GLX errors, as recommended by
Alexander Monakov.
glretrace,eglretrace: Factor out duplicate Xlib code into common module.
wgltrace: Update enums.
khronos: Refresh headers.