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BOINC web site: steer Android users to app stores
android: removal of cpu_usage_limit preference from UI. Set to 100 percent during launch.

Cpu_usage_limit has caused problems with:
- acquistation and release of wakelock and foreground state of service
- timeout of science apps, no progress
Therefore gets removed from UI. If user has customized this setting, the changes get reverted. Monitor sets this preference to 100 percent during launch of UI. This code should get removed again, once every installation is at 100 percent again, or if preference handling gets changed.
android: bug fix, introduced with previous commit
android: added support for wireless charger. treat like AC. Issue #1312.
android: fixes bug reported through PlayStore system: NumberFormatException in getPidForProcessName.
android: fixes bug reported through PlayStore system: IllegalStateException of Timer.

occured when forceRefresh() in Monitor was called after a manual studown, which cancels the timer.
android: fixes bug reported through PlayStore system: NullPointerException while seting up Tab layout.

getTabHost would return null in some cases, moved it into onCreate, where application context is always present.
android: attempt to fix bug #1300, number of cpu cores detection.

Parsing information at /sys/devices/system/cpu/present should represent possible number of CPUs indepentendly of CPU throttling.
Mac: Fix typos.
API: add debug-mode log messages for mutex acquire/release, to help diagnose Android bug
android: always showing the EventLog in the menu, regardless of advanced preference, enhancement #1314.