fixed to work with newer MH and perl5. Added trending of barom the wm2 d...

I was not able to get my wm2 to work on the newer MH on git in master.  It worked fine on old mh perl4 system. 

Let me know any patterns I used are going to cause any problems or if other fixes need to be made and I will adjust till this is ready to merge.

Fixes.
  The cron was broken and caused errors.
  The serial reading was broken added a chr() to fix the casting that does not work in perl5 
  The debugging flag was changed to lower case 'weather' to match other modules usage

Added 
  Barometer trending analysis