Fix CALACS version reporting

[pllim]

calacs.e --version now only reports the number. Added calacs.e -r to report version number and date.

Fix #75

c/c @jamienoss

[sosey]

looks good. calwf3 is the only one adding the extra "current version" text, I've asked DP what they prefer and will update when I hear back

update the syntax with the options as well

[pllim]

Okay. I updated the syntax printing.

$ calacs.e --version
9.1.0

$ calacs.e -r
Current version: 9.1.0 (21-Feb-2017)

$ calacs.e 
CALACS Version 9.1.0
syntax:  calacs.e [-t] [-s] [-v] [-q] [-r] [-1] input 

[sosey]

I'm merging this now @pllim