Add pg_read_binary_file() and whole-file-at-once versions of pg_read_file().

Itagaki Takahiro <itagaki.takahiro@gmail.com>

Commit: 03db44eae3e065174d5e29888b8d98c39b1f520b
Author: Itagaki Takahiro <itagaki.takahiro@gmail.com>
Date: 2010-12-15T21:56:28Z
Releases: 9.1.0
Add pg_read_binary_file() and whole-file-at-once versions of pg_read_file().
One of the usages of the binary version is to read files in a different
encoding from the server encoding.

Dimitri Fontaine and Itagaki Takahiro.

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