review use of /logger/history dir

[dd1]

I am not sure what/when uses /logger/history dir. Need to review this. In a way, it is redundant with /logger/history/midas/history dir (but there is historical use by old experiments). K.O.

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[dd1]

Places where “history dir” is used:

• history.cxx: “MIDAS” history hs_connect() uses “history dir”, “data dir”, crash if they are empty
• history_common.cxx: “FILE” history init, “history dir”, “data dir”, expt dir.
• history_image.cxx: same for “IMAGE” history
• mhttpd.cxx: loads resources from “/logger/history dir”
• mlogger.cxx: reads “/logger/history dir”, not sure what it does with it.

K.O.

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[dd1]

I think I know how I want it to work. We probe try in order: channel specific “/logger/history/xxx/history dir”, dedicated history directory “/logger/history dir”, the general data directory “/logger/data dir”, and finally the experiment directory (cm_get_path()). K.O.

[dd1]

if “history dir” does not start with “/” (relative path), make it relative to the experiment directory. K.O.

[dd1]

addressed in commit sequence ending with 5d52ca3. K.O.