Adding `split_str_d` function to `array_utils`.

Adding `split_str_d` function for splitting a string of doubles and
populating a `d_array`.

Adding tests of `split_str_d` and `split_str` to
`check_array_utils.c`.
Updating `parsing` functions.

Adding `parse_summary_file` to `parsing`.c/h. Also, updating
`parse_observed_stats_file` function to use `split_str_d` function.

Adding associated tests.
Updating `eureject` and incrementing version.

Overhauling parts of `eureject`. Mainly, having the means
and standard deviations for standardizing stats passed in via
a file rather than command line flag.

Because the CLI has changed, I am updating the version of
`eureject` to 0.2.

Updating tests.