WACCM7(x) compsets

[fvitt]

closes #1248
closes #1261

[brian-eaton]

I was expecting that CAM70%HT%CSO would be a waccm configuration, but configure is not setting waccm_phys="1" for this compset since it uses ghg_mam4 chemistry. Is it correct that FHIST_WAsc is not a waccm compset?

I would also propose that configure be responsible for always setting nlev rather than having just the cam7 settings be made from config_component.xml. Here is a suggested refactor of the code to set nlev:

# Number of vertical levels
my $nlev = 0;

# Defaults
if ($phys_pkg eq 'cam7') {
    $nlev = 32  # this is for some old cam_dev tests
    if ($model_top eq 'lt') {
        $nlev = 58
    } elsif ($model_top eq 'mt') {
        $nlev = 93
    } elsif ($model_top eq 'ht') {
        $nlev = 135
    } elsif ($model_top eq 'xt') {
        $nlev = 189
    }
}
elsif ($waccmx) {
    if ($phys_pkg eq 'cam6') {
        $nlev = 130;
    } else {
        $nlev = 126;
    }
}
elsif ($chem_pkg =~ /waccm_/) {
    if ($phys_pkg eq 'cam4') {
        $nlev = 66;
    }
    else {
        $nlev = 70;
    }
}
elsif ($phys_pkg eq 'cam6') {
    $nlev = 32;
}
elsif ($phys_pkg eq 'cam5') {
    $nlev = 30;
}
elsif ($phys_pkg eq 'cam4') {
    $nlev = 26;
}
else {
    # Simple models use cam7-lt vertical grid.
    $nlev = 58;
}