Enable 1D arrays of integers to be read from NetCDF files,
and made available via `Mesh::get()`. Mainly useful for
mesh construction.

When reading 1D vector of ints, check that the input is long enough,
and resize the output vector.

A short-term fix, allowing extra limiters to be added with inputs:

limiter_count : int
limiter_yinds : [int], length limiter_count
limiter_xstarts : [int], length limiter_count
limiter_xends : [int], length limiter_count

The limiter(s) are added between yinds[i] and yinds[i] + 1

Use the new track feature (better name required) to dump the different
components of the ddt() as well as the residuum for the evolved fields.

This keeps track of all the changes done to the field and stores them to
a OptionsObject.

This keeps track of all the changes done to the field and stores them to
a OptionsObject.

gcc 9.4 is unable to correctly parse the construction for the function
argument, if name.change is used directly. First making a copy seems to work
around that issue.

…into hermes3

…to hermes3