change version to 1.5b, remove unused code, insert ERR_UNKNOWNMODE if
mode is unknown.
remove unused code
change vesion to 1.5b
first commit.
#52
update comments, #52
#52
#52
insert todo
updated 1.5
updated
Merge branch 'features_1.5' into devel

Conflicts:
	src/class.sub.php
	src/class.wave.php