v0.6.0

• The command cluster can now take multiple knowledge files as input.
• The command addquotes can now take multiple knowledge files as input.

Bug corrections:

• Fixed #33 (clustering): non-breakable spaces are now correctly taken into in the distance computation (bug reported by Antonio Casares)
• Fixed #32 (addquotes): there was a misalignment whenever tabulations were used.

Misc:

• All knowledge files now use the extension .kl instead of .tex (suggested by Aliaume Lopez)