[WT-support] Nightly build

[Laurent HAAS - F6FVY]

Hi all

Phil VE2FU reported me privately this morning the current nightly build 
was corrupted.

As I'm regularly facing this issue, I decided to modify the zip 
compression process, and adopted the free and open source 7-zip software 
  (http://www.7-zip.org/) for this task.

Surprisingly enough, the obtained zip packages are somewhat smaller than 
before (1.0 MB vs 1.2 MB) !

Feel free to report any problem with this new packaging method.

73

Larry - F6FVY