AOQuality - Handle AOFlagger measurement set quality statistics

**aoquality** <action> [

*options*]

**help**
- Get more info about an action (usage: 'aoquality help
<action>')

**collect** [-c/-tf/-h] <ms> [quack timesteps]
[list of antennae]
- The collect action will go over a whole measurement set and
collect the default statistics. It will write the results in the quality
subtables of the main measurement set.

- Currently, the default statistics are: RFIRatio, Count,
Mean, SumP2, DCount, DMean, DSumP2.

- The subtables that will be updated are: QUALITY_KIND_NAME,
QUALITY_TIME_STATISTIC, QUALITY_FREQUENCY_STATISTIC and
QUALITY_BASELINE_STATISTIC.

**-c** will use the CORRECTED_DATA column. and writes
them in the quality tables.

**combine** <target_ms> [<in_ms>
[<in_ms> ..]
- This will read all given input measurement sets, combine
the statistics and write the results to a target measurement set. The
target measurement set should not exist beforehand.

**histogram** <query> <ms>
- Various histogram actions.

- Query can be: rfislope - performs linear regression on the
part of the histogram that should contain the RFI. Reports one value per
polarisation.

**liststats**
- Display a list of possible statistic kinds.

**query_b** <kind> <ms>
- Prints the given statistic for each baseline.

**query_t** <kind> <ms>
- Print the given statistic for each time step.

**query_f** <kind> <ms>
- Print the given statistic for each frequency.

**query_g** <kind> <ms>
- Print the given statistic for this measurement set.

**remove** [ms]
- Completely remove all quality tables from the measurement
set.

**summarize** <ms>
- Gives a summary of the statistics in the measurement
set.

**summarizerfi**
- Give a summary of the rfi statistics.

A few actions take a statistic kind. Some common statistic kinds are:
StandardDeviation, Variance, Mean, RFIPercentage, RFIRatio, Count. These are
case sensitive. Run 'aoquality liststats' for a full list.