Releases for Masquerade

Changes since DRUPAL-6--1-1:

#373194: notice: Undefined variable: quick_switch_link by beginner
#268487: turn subquery into join in the cron by PMunn
fix PHP notice on logout for unset object by cYu

#285472: Parse error with PHP 4 - remove chained object reference to support PHP4 by Junyor

#138860 by bwynants - Performance tweaks.. and moved "masquerade as.." under new heading.
#174650 - access denied when attempting to switch back
#227924 - integration with alt_login
#268487 - add a database cleanup cron when people don't use the switch back link
#281468 - multiple quicklinks by cYu
add an uninstaller function
coder module cleanup
other misc bugfixes

In line, 89, 313:

Changed:
cache_clear_all();
to:
cache_clear_all($user->uid, 'cache_menu', true);

Most functionality works in Drupal 7 UNSTABLE-6, with the exception of the quick switch list of users in the block and masquerade as link on each user page.