...with explicit pangomm/cairomm versions

re #105

fix #105. Unclear why things work/failed where they did.

fixes #106

fixes #98

Quadratic behavior reduced to n.log n. Better is surely available but
this will do for now.

(Distinguish from Render::Context...)

Not actually very useful given the reports we actually generate.

...since that's what all the production callers use anyway.

re #63

re #63

re #63

re #63

This reverts commit 1c99194c.

--noatime turns out to be a specific to a small set of Debian
releases. It is replaced by --open-noatime. When that is more
generally available I'll start using that.

fixes #101

#92

re #100

fixes #97

fixes #100

- RSBACKUP_TIME="" is equivalent to unset
- tests.sh:s now has only one execution line

re #100

fixes #96

Includes a test for parseFloat.

fixes #99

See travis branch for attempts to get them working again.

fixes #92

fixes #93

fixes #94

re #94

tests/backup is a Bash script now.

fixes #95