phpMyAdmin work during thirty fifth week

The bug fixes carried out during the week was mostly on the master branch and most of them were due to the ongoing developments by GSoC students. Additionally a couple of bugs on the stable branch reported by the users were fixed. Following are the bugs fixed during the week.

Bugs fixed
#4932 Drizzle version numbers
#4936 utf8mb4 fields show only ????s for 4-byte Unicode characters after import
#4937 Custom export with backquotes off is not working
#4939 Connection input field not hidden when adding a new table
#4940 Notices in GIS visualization page
#4941 Table structure multi submit is broken
#4942 Export to gzip saves plain text under Chrome

Moreover, following bugs were investigated

Bugs investigated
#4933 INSERT validation issues with MySQL functions
#4935 Eliminate remaining occurences of eval() in phpMyAdmin to make it work on machines where eval() is disabled

On the new features front, rfe #1634 was discussed during the last IRC meeting and received the green light to be implemented. This rfe requested not to group items in the navigation panel when there is only a single group and no other items or groups in a particular sub tree.

Bug #4934 reported the shift + click to apply selected function to all rows in insert/edit page was not functioning in some browsers. Since shift + click event was non standard on browsers we decided to remove the feature altogether. This was also carried out during the week.

Feature requests implemented
#1634 Don't group tables in tree if the result has only one group
#1677 Support spatial indexes in table create form
Remove support for Shift + Click on function name to apply to all rows in insert/edit page

During the latter part of the week, I engaged in analyzing the performance issues and fixing them. This was based on the profiling carried out earlier using xdebug. I attended to table browse, insert and edit pages since they showed highest performance deterioration competed to 3.x series.

General coding improvements
Fix coding styles violations reported by PHPCS
Performance improvements for table browse, insert and edit pages