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use lowercase for tags

I propose to use lower case for tags. It turns out that it is confusing that for same tags we use uppercase. So I propose

# Comments with additional  info about data set
# Comments are ignored when reading by the parser  

nx                       24   # lattice
ny                       28   # lattice
nz                       32   # lattice
dx                        1   # spacing
dy                        1   # spacing
dz                        1   # spacing

To maintain compatibility with the previous version, the parser will be CASE-INSENSITIVE for the listed above tags. I mean that in wtxt I can write it as:

NX                       24   # lattice
NY                       28   # lattice
NZ                       32   # lattice
DX                        1   # spacing
DY                        1   # spacing
DZ                        1   # spacing

but this I keep only for compatibility.
Note: This point I regard, as important because it turned out that keeping uppercase for tags like NX, DX introduces sometimes conflicts with W-SLDA, where NX, DX, ... are predefines.