Syntax error fix

SQL was pointing to an non-existent column in Leaders table and the
SELECT portion didn't require parentheses around the options
CSD text fix

Fixed text description for Philantropy when CSD is used
Updates from Stable
Merge branch 'new-features' of https://github.com/Thalassicus/cep-bnw into new-features

Conflicts:
	Cat/Cat/AI/CEAI_LeaderFlavors.sql
	Ceg/Ceg/AI/CEAI_LeaderFlavors.sql
Update CEC__End.sql

The IS NULL check is needed here since " <> " doesn't work on NULL booleans.
They are either 1 or 0, true or false. If the field is a NULL then the check must be for a NULL.
Merge branch 'new-features' of https://github.com/Thalassicus/cep-bnw into new-features
Merge remote-tracking branch 'origin/new-features' into stable

Conflicts:
	Ceg/Ceg/Ceg.civ5proj