[Cin] some problems - batch rendering warnings and opening project error, steps to have cinelerraGG officially in Gentoo

[Phyllis Smith]

> some projects had cursor at end.
>
It may be good to have warning about this - something like "Your cursor
> isn't at start of project".
>
OK, gg will be adding a warning before the next builds and I will include
it in the manual too.

A warning has been added and checked into GIT so will be available in the
next builds.  Hopefully, this will avoid future users being flummoxed by
this problem.  A warning box popups that is scrollable and will look
similar to the following:

3 job EDLs begin position beyond end of media
1: /tmp/test.xml
2: /tmp/test.xml
3: /tmp/test.xml
press cancel to abandon batch render

(IgorB: even though this warning may not be necessary, it is helpful to me
for sure).  Phyllis/GG
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