Fix lock behaviour

[passcod]

Current behaviour: "Don't start compiles within 2 seconds of start of current compile."
Intended behaviour: "Don't start compiles while current one is running."

Might also want to:

• wait until watched directory has "settled";
• forbid compiles to run within N seconds of each other (end1 -> start2), to avoid compiling too often when in the habit of saving compulsively (configurable, behind a flag);

[kstep]

Do you need some help here? I can help you, but my further work will be based upon #6 and #8 (or at least #6, if you don't want to merge #8).

[passcod]

I would love some help!

But... currently my development computer is down for the count and I haven't managed to fix it or get a replacement so I can't test anything, publish changes and crates, and generally have access to my development tools. So everything will have to wait until this weekend, sorry.

[passcod]

I'll be able to look, test, and merge next weekend at the latest, but no earlier than the 21st. Again, sorry for the delay.

[kstep]

NP. Actually I took a little break after a quite long streak. My vacation is over, so I don't have as much time of OS projects as I had, so I'm busy with main job now.

[passcod]

Woo! I'm back in the land of the linux :) If you've got something for this, greatly appreciated, otherwise I'll probably pick it up later, say next month.