increase log buffer about alogcat HOT 3 CLOSED

on second look this isn't so clear. -r requires -f, and -f requires a file name 
where to log the file. i don't want to log to a new file. so maybe my 
understanding of logcat is wrong.

it looks like logcat is just a wrapper around /dev/log/*. so the "buffer" is 
completely managed by me. i could have something like "start  /stop buffering 
to file", but i'd have to be careful about storing the PID so it could be 
stopped again. 

marking this will not fix. there's no obvious way to do this. the /dev/log 
device has a fixed window size and i do not see where or how to increase that. 
logcat could keep a larger history that this (sacrificing performance), but 
that would last only as long as it was running in the foreground. the next time 
it started, it would only have the /dev/log window entries.

as a workaround, version 2.0 has "periodic save", so you can capture the 
/dev/log window at a configurable interval.