Shortcut for running tests

[fredrik-johansson]

Instead of having to type

build/fmpz_mat/test/main fmpz_mat_mul

we could allow something like

./test fmpz_mat_mul

This would be even more useful with wildcard support:

./test fmpz_mat_mul_*

[albinahlback]

Since we use Make for everything, perhaps the best thing would be to integrate it into there?

[fredrik-johansson]

Reopening because the syntax still isn't especially convenient. I would like to be able to test a function by name without also specifying the module.

Also, a wildcard feature isn't implemented.

(There is also no documentation of this feature in #1825.)

[albinahlback]

Hmm, yeah, I misunderstood. This should be possible.

[albinahlback]

For REGEX stuff, we can use PCRE2. Should be available on most modern systems. Will try to fix this during next week.