in PrePARE, logfile-friendly output format

[alaniwi]

Example output of PrePARE as it appears when redrected to a file and displayed with less:

ESC[1;32m^MCheck netCDF file(s): ESC[0m12% | 1/8 filesESC[1;32m^MCheck netCDF fi
le(s): ESC[0m25% | 2/8 filesESC[1;32m^MCheck netCDF file(s): ESC[0m37% | 3/8 fil
esESC[1;32m^MCheck netCDF file(s): ESC[0m50% | 4/8 filesESC[1;32m^MCheck netCDF 
file(s): ESC[0m62% | 5/8 filesESC[1;32m^MCheck netCDF file(s): ESC[0m75% | 6/8 f
ilesESC[1;32m^MCheck netCDF file(s): ESC[0m87% | 7/8 filesESC[1;32m^MCheck netCD
F file(s): ESC[0m100% | 8/8 files^MESC[KESC[1;31;47m
================================================================================
=====
The variable ua could not be found in file
================================================================================
=====
ESC[0m
ESC[95m
Number of files scanned: 8ESC[0mESC[1;31;47m
Number of file with error(s): 1ESC[0m

It would be good to suppress the colours and progress meter when stdout is not a terminal, in order to get something like this instead (this suggestion also includes the filename, based on #533):

Error(s) in: ua_Amon_SomeModel_piControl_r1i1p1f1_gn_123456-234567.nc
   The variable ua could not be found in file
Number of files scanned: 8
Number of file with error(s): 1

Thanks.

[durack1]

@alaniwi thanks for raising these requests (this, plus #533, #532). As an FYI, PrePARE is included in this repo (see PrePARE.py). We welcome pull requests with your suggestd code enhancements, which will lead to a much faster turnaround than waiting for these requests to be implemented at LLNL

[alaniwi]

Noted, thanks.