ad_sthlp : identify and format bullet points

[kbjarkefur]

Identify rows that are bullet points. and format them like this in Stata:

{p 8 8 2}- Search over variable labels only{break}
- Specify search through (regex) patterns{break}
- Restrict search to an (optionally) user-provided variable list{break}
- Invert search to identify variables whose variables do not match{break}
{p_end}