[Cin] variable fast/slow playback speed hack

[Phyllis Smith]

Andrew,  I tested the changes to *exportedl.C* that were included in the
SLOW/FAST_SPEED patch - 0001-Add-hidden-fast-slow-playback-preference.patch
- (looks like they tried to sneak into the patchset !)  Does adding FROM
FILE improve the CMX output and can Andrea test after I check it in?  Just
want to know its purpose so that I can put that in the Release Notes.

so i wondered if changing speed for fast/slow reverse and normal playback
> was possible..0001-Add-hidden-fast-slow-playback-preference.patch
>
> after few hours of hacking I made this patch.
>
> it makes fast/slow playback speed configurable in Cinelerra_rc via new
> stored variables:
>
>
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