Log Message:
Update to 0.46.

- 0.46 | 2013-03-14

  - bugfix: handle connection options w/o "backup" env var

	Previously, ‘pg-conndefaults’ expected every option to have a
	backup env var (e.g., option ‘#:host’ and env var ‘PGHOST’).
	For later versions of PostgreSQL which no longer maintain this
	1:1 correspondance, Guile-PG would segfault.

	Now, in such cases, the value associated w/ the key ‘#:envvar’
	in the alist returned by ‘pg-conndefaults’ is ‘#f’.

  - planned retirement
    - procedure ‘(database postgres) pg-getline’
    - procedure ‘(database postgres) pg-getlineasync’
    - procedure ‘(database postgres) pg-putline’
    - procedure ‘(database postgres) pg-endcopy’

	These procedures are obsoleted by ‘pg-get-copy-data’ and
	‘pg-put-copy-data’.  They WILL BE REMOVED by 2013-12-31.

	Actually, the first two were originally -- in Guile-PG 0.41
	(2011-09-29) -- planned to be removed by 2012-12-31.
	Support has been extended for solidarity w/ the latter two.

  - bootstrap tools upgraded
    - GNU Texinfo 5.1

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