Survey what versions of shells are available across platforms

[mkropat]

There's already a table showing if a given shell is available as a command, but it would be great to add a table that showed which specific version of a shell is installed, since, for example, there's a big difference between Bash v3 and Bash v4.

It'd also be useful to know what versions of other software is installed on the system, although distrowatch.com already does that, to an extent.