Name: frog_curse - cast a frog curse upon a living

Syntax:
	int frog_curse(int frog)

Description:
	The frog_curse function turns a living into a frog or back. The living
	is informed about this action.

	If the frog argument is 1 it is turned into a frog, else it is turned
	back.

Return value:
	The function returns the new frog status. 1 if the living is a frog
	now, 0 if it is not.

Examples:
	this_player()->frog_curse(1);

See also: living/query_frog