lib/Linux/Capabilities.pm: Added defines for all capabilities
- all exported functions are on separate line for better readability
- added a few more names of functions that should be implemented
lib/Linux/Capabilities.pm: added cap_is_supported()
lib/Linux/Capabilities.pm: added cap_valid, to check if a capability is actually valid
Capabilities.xs: updated the return value, switched from double to integer
Capabilities.xs: added cap_is_supported
Capabilities.xs: added cap_is_supported()
Capabilities.xs: added get_cap_bound()