[B2-devel] Basilisk II versioning

[Gwenole B. <gb....@fr...>]

Hi,

I have attached a patch I would like to commit since it clarifies the 
status of snapshot releases.
This adds a "-Pre (__DATE__)" suffix to user-visible version strings.

Since this changes the default version string and introduces extra work 
to actually redefine VERSION_DEVEL to "" on official releases, I wanted 
to pass this on first for review. Is this OK?