Typo fixes in install doc.  Document nccopy chunk threshold.
Merge branch 'master' of https://github.com/Unidata/netcdf-c

Conflicts:
	ncdump/nccopy.c
Removed doxygen man page, since it now is in the User Guide.
Merge branch 'master' of https://github.com/Unidata/netcdf-c