Tab characters

[repositony]

MCNP6.2 allows tab characters apparently, so this will upset the card keywords where the regular expressions look for spaces. Will probably need to include a '\t' in the regex for most things.

[repositony]

Tab characters in the input file are converted to one or more blank spaces, such that the character following the tab will be positioned at the next tab stop. Tab stops are set every eight characters, i.e., 9, 17, 25, etc.

The limit of input lines to 128 columns applies after tabs are expanded into blank spaces. It is recommended that blank spaces be used instead of tab characters for this reason.