Bump version to 1.9rc2

Bump version to 1.9rc1

Bump version to 1.8.1 and copyright year to 2021

Makefile: add release target to upload to PyPI

Bump version to 1.8rc5

Bump version to 1.8rc4

Bump version to 1.8rc3

Rename --literal/-l to --fixed-strings/-F, after grep; bump version t…

…o 1.8rc2

Fix incorrect line breaks in man page

Run help2man with COLUMNS=999 so that rpl doesn’t wrap its output, and hence
help2man doesn’t insert incorrect line breaks (.IP) in its output.

Bump version to 1.7.2