pgsql: Modernize entab source code

Modernize entab source code
Remove halt.c, improve comments, rename manual page file.

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/f979599b2068f036405f1b51a9c4260619b06941

Modified Files
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src/tools/entab/Makefile | 2 +-
src/tools/entab/entab.1 | 51 +++++++++++++++++++++++++++++++++++++++
src/tools/entab/entab.c | 30 +++++++++++------------
src/tools/entab/entab.man | 52 ---------------------------------------
src/tools/entab/halt.c | 59 ---------------------------------------------
5 files changed, 66 insertions(+), 128 deletions(-)

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