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simplify UTF-8 detection

Fix sort by cstime

Fix typo in comment

htop uses scanf functions to parse values from proc filesystem. This
breaks when initializing locale for LC_NUMERIC because of unexpected
commas. So initialize locale for LC_CTYPE only.

This has two effects:

* The locale may have impact on string formatting. So depending on the
  locale we may end up with different decimal point.
* We can use nl_langinfo() for UTF-8 detection.

paint PROCESS_LOW_PRIORITY in green

... and thus make it use a different color than PROCESS_HIGH_PRIORITY.

write header length (number of columns) back to configuration

ignore enter, delete and space on empty panel

Change all displayed memory size specifiers to use GNU Coreutils style size specifiers

The man page now contains the section "MEMORY SIZES" which talks about
the convention used for representing memory sizes and why it was chosen.

The MemoryMeter and SwapMeter now use the short GNU Coreutils style
format to represent memory sizes.

fix compiler warnings

add */.dirstamp to .gitignore

added missing defines for android

Fix several FreeBSD compilation errors

`Process_new_fn` had been renamed to `Process_New` in
d880def0

Several functions and struct had changed in
b291fba0

gcc gives warnings like this:

warning: ignoring return value of ‘fscanf’, declared with attribute
warn_unused_result

Assign value to a variable, cast to (void) to discard it.

Closes #185.
Closes #190.

Read OOM data only if column is enabled.
Make sort ordering more consistent. Closes #182.