(battery-linux-proc-acpi): Ignore all hidden files in the battery dir.
Use dolist (and less indentation). Use erase-buffer.
Pre-initialize `design-capacity', `warn', and `low'.
(battery-format): Use replace-regexp-in-string.
(battery-linux-proc-acpi): Attempt to gather information from all
battery subdirectories regardless of their file name.
(battery-linux-proc-apm): Replace all occurrences of
battery-hex-to-int-2 with string-to-int (base 16).
(battery-hex-to-int-2, battery-hex-to-int): Delete functions.
(battery-hex-map): Delete variable.
systems appear to use mW, make the code handle this. Fix a
division-by-zero bug while at it, and handle kernels with
a slightly different layout in /proc/acpi.
Update Commentary and Copyright.
(battery-linux-proc-acpi): Fix a bug in %b which made "!" never
appear due to wrong ordering of the expressions in `or'.
(battery-status-function): Modified default value calculation to also
check for availability of ACPI.
(battery-echo-area-format): Ditto.
(battery-mode-line-format): Ditto.
