Improve Tab renaming

[reg]

Renaming tabs is a bit obnoxious with two different cases:

A. You have use_vte_titles enabled (default) In this case, renaming is useless as the terminal will override tab name everytime.

B. You don't have use_vte_titles. In this case, you're greated with useless names by default but you can rename them.

In means that either you rename all your tabs or you can't rename any.

I believe a lot of people (like me) would want the vte_titles behavior with the ability to rename still.

I wrote a little patch which does just this: * If you rename a tab yourself, it won't be updated. * If you rename it to blank, it will be updated again (reset)

[lincoln]

Awesome improvement. Thank you for that. This patch will be in the next version for sure! :)

[Dokan]

 https://github.com/Guake/guake/issues/58