OpenGL2: Small glsl shader optimizations, fixes, and cleanup.
Fix playback of stereo sounds in Base sound system

Already works correctly in OpenAL.
Don't forget to install the renderer2 binary if USE_RENDERER_DLOPEN=0
#6077: OpenGL2: Add r_ignoreDstAlpha.
Fix PNG tRNS length checks
Make GL2 MDR code use R_VboPackNormal for normal
Remove extra client_t::csUpdated[] slot

sv.configstrings[] is limited to 0 to MAX_CONFIGSTRINGS-1, make client_t::csUpdated[] the same.
Fix music studder in base sound when starting silent cinematics
Fix demoName Com_sprintf size larger than buffer

Maybe this is why demoName is a static global with the comment 'compiler bug workaround'?
Fix GL2 deluxemap 0,0,0 to 127,127,127

Checked if first byte was 0 twice instead of checking second byte.
Don't read clc.voipIncomingSequence until range checked sender
Remove unused code path from S_Base_StartBackgroundTrack

We make sure intro isn't NULL. Then if loop is NULL, set it to intro.
Merge pull request #26 from andreyv/master

Include opengl2 client in make copyfiles if USE_RENDERER_DLOPEN=0
Don't create images/framebuffers that won't be used, and add checks before use.
don't call va each frame in GLSL_VertexAttribPointers
Merge pull request #30 from inolen/nova_fix

don't call va each frame in GLSL_VertexAttribPointers
Fix OpenGL2 non-HDR map surface over brighting

Vertex lit map surfaces were saturating to white when
r_mapOverBrightBits was increased and r_hdr was disabled.

Now the color is normalized like lightmaps and lightgrid
when r_hdr is disabled. Which is the same as OpenGL1.

Noticeable on misc_model trisoup.
don't clear screen during CA_LOADING and CA_PRIMED
Check for buffer overflow for rail/lightning surfaces
Fix check for jpeg_mem_ to work with libjpeg-turbo