Begin rewriting method system

* src/builtin.c, src/builtin.h: New files.
* src/Makefile.am (wydawca_SOURCES): Add builtin.c and builtin.h
* src/config.c: New keyword access-method.query
* src/update-2.0.awk: Update.
* src/meta.c: Remove quote_string (replaced by method_quote_string).
(meta_escape): Add `handle' argument.
* src/method.c (struct method_descr): New methods: open, close, quote.
Updated methods: free, run, get. All callers updated.
(method_quote_string): New function.
* src/process.c (scan_directory_pair): Init all access methods at once.
* src/sql.c: Take name of the SQL connection from method->parmv[0].
Adapt to changes to the method subsystem.
* src/sql.h: Likewise.
* src/wydawca.h (struct access_method): New members id, parmc, parmv,
storage.
Remove union v.
(meta_escape): Take 3 arguments.
(method_new): Take 2 arguments.
(method_open, method_close, method_quote_string): New proto.
(method_run, method_result): Change signature.
* src/mail.c, src/triplet.c, src/verify.c
* etc/wydawca.rc: Update.

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