[m-rev.] diff: rename some types and functors to avoid parentheses

[Zoltan Somogyi]

There are no algorithmic changes. The diff is huge but very boring, since
most of it was done via automatic substitutions. It is in ~zs/tmp/DIFF.parens.

Zoltan.

compiler/*.m:
	Rename the types 'type', 'inst' and 'mode' to 'mer_type', 'mer_inst'
	and 'mer_mode'. This is to avoid the need to parenthesize these type
	names in some contexts, and to prepare for the possibility of a parser
	that considers those words to be reserved words.

	Rename some other uses of those names (e.g. as item types in
	recompilation.m).

	Delete some redundant synonyms (prog_type, mercury_type) for mer_type.

	Change some type names (e.g. mlds__type) and predicate names (e.g.
	deforest__goal) to make them unique even without module qualification.

	Rename the function symbols (e.g. pure, &) that need to be renamed
	to avoid the need to parenthesize them. Make their replacement names
	more expressive.

	Convert some more modules to four space indentation.

	Avoid excessively long lines, such as those resulting from the
	automatic substitution of 'mer_type' for 'type'.
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