[Eeglablist] ERSP on components in STUDY

[Pieranna Arrighi]

Dear Arno,

I referred to the following bug:

in the 10_2_4_4a version, std_ersp.m, fix important bug for computing ERSP
of components in STUDY (SVN 9355 - Arno).

Indeed, I have loaded the above reported version as well as other
following versions (included the latest, 2012) and I found that all seem
OK (ersps on components are as expected on the basis of hypothesis,
channel results, etc), while versions before the 10_2_4_4a give really
different results.

best regards
Pieranna