Seems to fix ConSiGno's loss of interpolation after non-blocking
screenwipes.

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Subversion-revision: 2830
Remove debug display

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Subversion-revision: 2831
Proper interaction of deep water with interpolation.

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Subversion-revision: 2832
Missed a few instances of use of viewplayer->mo->subsector->sector

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Subversion-revision: 2833
Option r_boomcolormaps applies the view.sector's colormap to all
rendered sectors, for backward compatibility. Currently cvar only.

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Subversion-revision: 2834
Minor cleanup

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Subversion-revision: 2835
Changelog update: 12/25 to present.

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Subversion-revision: 2836
Added /usr/local/share to the basepath search in Linux, for those
installing directly with make.

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Subversion-revision: 2837
* Apply COPYING-EE terms to DavidPH's code as he agrees to it.
* Minor cleanup in r_portal.cpp

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Subversion-revision: 2838
Rephrase section 1 term A to avoid sovereignty issue by naming the WIPO
copyright treaty rather than the DMCA of US law in particular (same as
GPLv3 itself).

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Subversion-revision: 2839
* Timer HAL module
* Refactored code from i_system.cpp into i_sdltimer.cpp
* Eliminated I_WaitVBL

Subversion-branch: /trunk
Subversion-revision: 2840
Revamped interpolation; hopefully more tolerant of timing variances
(similar to PrBoom-plus and D64EX)

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Subversion-revision: 2841