Add additional search by user or group and extra user fields in social search
Fix searching by extra user fields if no value selected
Fix searching by extra user fields if no value selected
Fix indentation, validation, unnecessary validations, language -- Recovering extra fields state after posting form!
Enabling extra fields only when User's search type selected (maybe more logical)
Allow session-to-session copy - refs BT#8986
Add configuration variable - refs BT#8986
Some PSR-2 fixes - Removing unnecessary vars
Fix copy only sessions items - refs BT#8986
List same course only - refs BT#8986
Fix confusing message - refs BT#8986
Minor - format code - refs BT#8986
Minor - Code conventions - refs BT#8986
Fix full copy - refs BT#8986
Improve selected items copy - refs BT#8986
Session list with the same origin course - refs BT#8986
Merge branch '1.9.x' of https://github.com/chamilo/chamilo-lms into 8986

Conflicts:
	main/install/configuration.dist.php
Fix session-to-session copy of surveys - refs BT#8986
Minor - Fix PHPDoc - refs BT#8986
Minor - format code.