#5 disable teaching tab when not in an online teaching game

[yzhh]

This patch is intended to solve bug 1717208:
"'mark' button in sidebar does not work as documented".

Since 'mark' is (only) functional for online teaching games,
this patch disables the teaching tab on the sidebar when not
playing an online teaching game, so that the 'mark' buttion
(along with other things) will not show up and confuse the user.

The patch is made against qGo 1.5.3 source (tar.gz downloaded
from sourceforge download, not cvs code). Modification is small
- all changes are in src/interfacehandler.cpp,
InterfaceHandler::toggleMode()

[yzhh]

$.../qgo-1.5.3> diff -c5 ./src ../qgo-1.5.3-1/src/ > qgo-src.diff

[yzhh]

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Plus, the patch is built and run with expected result, though the testing
is not exhaustive.

[Nobody/Anonymous]

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Thanks for this. I'll put it up this week