BatteryMonitor supports NetBSD

BatteryMonitor for GNUstep now has support for NetBSD acpi too now! Support languished because decent acpi support in NetBSD is relatively recent and reading it requires checking a property list (which is of course more complex, but at least consistent and clean compared to the maze of files linux provides). To manipulate it libprop sports handy functions, yet I always had some problems here and there, until I realized something very cool. Property lists are familiar to GNUstep and Cocoa users.
char * prop_dictionary_externalize(prop_dictionary_t dict);
Exports fully-fledged XML property list compatible with GNUstep plists, not just something similar. Thus it is a matter of using
-[NSString propertyList]
to get a dictionary and manipulate it with obj-c iterators, which is much more convenient than the equivalent C function provided by libprop.

Support is still quite rough and, for example, only the first battery is checked. I have only one NetBSD laptop and I don't know how NetBSD shields the results from BIOS idiosyncrasies I experienced on Linux (watt-hour and ampere-hour usage and orthogonality for example). But it is already very nice!