Removed .if_length_equals() etc commands, since it seems better to leave those until there is an immediate need.
Removed tests for .if_length_equals() operator in test1.
Updated docs with minor changes.
Re-organized the TODO list.
Added stub code for validating implicit loop template strings.
Added the {\makeellipsis} command for templates, in case users want to use triple dots without causing an implicit loop or line continuation.