Show information about unknown ASEs and extensions in .MIPS.abiflags

bfd/
	* elfxx-mips.c (print_mips_ases): Print unknown ASEs.
	(print_mips_isa_ext): Print the value of an unknown extension.

binutils/

	* readelf.c (print_mips_ases): Print unknown ASEs.
	(print_mips_isa_ext): Print the value of an unknown extension.

include/

	* elf/mips.h (AFL_ASE_MASK): Define.
MIPS Documentation fixes

gas/
	* doc/as.texinfo: Update the MIPS FP ABI descriptions.
	* doc/c-mips.texi: Spell check and correct throughout.
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