2.1.0 released

This is a big update to the previous version. The changes:

- Dashboard implementation (by Bishop Bettini)
- start/stop date for a survey (by Bishop Bettini)
- A conditional question resulted in a "non-required" for the question it depends on, this limit has been removed.
- You can now do authenticated ldap binds when searching for the uid, some LDAP servers need this (is more secure than anonymous binds anyway)
- A default config file has been added (admin/phpESP.ini.php.default), your own changes should go into admin/phpESP.ini.php. The advantage is that new options can be added to the default file and you don't need to change anything to your own config file. Also a fixed part has been added (admin/phpESP.ini.php.fixed) containing values that should not be changed. The sequence is:
require (phpESP.ini.php.default); ==> defaults, gets overwritten with every new release
require (phpESP.ini.php); ==> your own values, never gets overwritten
require (phpESP.ini.php.fixed); ==> fixed parts, you can change these, but they get overwritten with every new release
- Web based updates and web based installs are now possible, no more manually entering sql statements in the db
- Switching/changing database table prefixes is now possible
- An answer to a question of type textbox, essay or numerical can now be required to be unique

Enjoy!