Rename project from cltest to clitest

Choosing an unpronounceable name was a mistake. AGAIN. txt2regex,
txt2tags... I keep falling in this trap.

Also, the 'lt' part of the old name was bugging me. It's ugly in
non-monospaced fonts. The added 'i' separates them. The result is a
more visually pleasuring word, compare: 'cltest' and 'clitest'.

Also, the 'doctest' similarity becomes more evident. s/doc/cli/. Same
numbers of chars.

Also, 'clitest' has 7 letters. Seven is good. And I have a personal
connection, since I was born in day 7, year 1977.

Also, the 'clit' prefix may be amusing for some ;)

What's the importance of the name? HIGHLY IMPORTANT. It's like naming a
son. You'll call him that way for a long time. You gotta choose a good
one.
Rename file from cltest to clitest