Tweak docs; add example to csv page
Copy tweak
Add find and replace operator
Rename subs to replace; link up the doc page
Merge pull request #86 from andylolz/77-subs

Add find and replace operator
Refactor; Add column selector to `replace` op
Merge pull request #89 from andylolz/77-sed

Add column selector to `replace` op; refactor
Remove -H option from html operator
Refactor code related to col/row ranges
Fix bug introduced in 03b81d1c
Use any (not each) in grep
More detail in the noop log message
Add a makefile for test running
Add testing to README; other minor text tweaks
Add documentation for replace -c option

replace -c was added in 658e350c, but not documented (or tested, for
that matter).
Workaround for slightly weird optimist behaviour.

Optimist allows you to specify that an argument should remain a string,
not parsed as an integer. However, this rule isn’t applied when an alias
of the option is used.
Merge branch 'master' into 75-interactive