nios2: Add optimized IP checksum support
nios2: Rename file
nios2: Add _Nios2_Count_leading_zeros()

Add _Nios2_Count_trailing_zeros().  They are currently more efficient
than the corresponding GCC builtins.
nios2: Set CPU_ISR_PASSES_FRAME_POINTER to FALSE

This reflects what is currently happening.  Define CPU_Interrupt_frame
type to void to prevent accidental usage.
nios2: Use NIOS2_CTLREG_INDEX_STATUS
nios2: Documentation
release_support: Remove obsolete file
beatnik/Makefile.am: Remove reference to ChangeLog
mvme3100/Makefile.am: Remove reference to ChangeLog
doc/main.am: TEXI2HTML_ARGS macro clean up
doc/project.am: texi2html invocation had file name twice
doc/texi2html_init.in: Update copyright on html output
doc/main.am: Tweak TEXI2ANY_ARGS to make HTML menus look better
doc/texi2any_init.in: Correct link to Library index.html
doc/texi2html_init.in: Correct typo
contrib: Remove.
mpc83xx: Add MPC83XX_HAS_NAND_LP_FLASH_ON_CS0
mpc83xx: Fix local access window 1 configuration
mpc83xx: Copy nothing if necessary
mpc83xx: Use shared linkcmds.base