169c8038dd
We now keep a small set of historic procstats data. Each time you reboot a new set of data is created; each day a new set of data is created. At most 5 sets of historic data are kept at a time. Each checkin only prints any existing historic data (and deletes it); checkins do not include the current data, to keep the checkin data less noisy. This requires a bunch of re-arranging of the way state is maintained to allow the multiple files, and loading and processing state from old files. Also fixed some problems with writing/reading state. The checkin format has been tweaked. There is a new "period" line that tells you (1) the date/time stamp of the data, (2) the device realtime data collection started, (3) the device realtime data collection finished. The difference between the last two give you the real time duration for which the data was collected. Also, the third field of pkgproc and pkgsvc-* can now be abbreviated: if it is the same as the package name, it is empty; if it is a suffix fo the package name it starts with '.'. Change-Id: I422875fccb627d95df7e36c183ac90056f273d83