Changes On Branch nameofexe-appendvfs-check

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Changes In Branch nameofexe-appendvfs-check Excluding Merge-Ins

This is equivalent to a diff from 491b986d to 169a3dab

Ensure that db_open()'s db-is-an-appendvfs-binary check uses canonicalized filenames to avoid the problem reported in forum post 16880a28aad1a868. ... (check-in: ab7ad234 user: stephan tags: trunk)
Fix an unused var warning in windows ... (Closed-Leaf check-in: 169a3dab user: mgagnon tags: nameofexe-appendvfs-check)
Calling db_open() to determine if a given repository is valid rather than a hand-rolled sqlite3_open() call. This then allows us to call db_looks_like_a_repository() to determine if the DB is a valid repo rather than duplicate the checks it already has in another nearby context. This is part of the apndvfs vs normal-case stuff done in prior commits, consolidating the notion of "valid" to a single spot in the code. ... (check-in: 69145d9d user: wyoung tags: trunk)
Resolve the bug revealed in forum post 16880a28aad1a868 in which the db_open() appendvfs check can misinteract with g.nameOfExe. This is in a branch until a Windows user can confirm that the g.nameOfExe change in main.c behaves as desired on Windows. This was a collaborative bug fix via /chat, not my own. Edit: test success on Windows reported by Martin G. ... (check-in: ec02acfd user: stephan tags: nameofexe-appendvfs-check)
Since checkin [d8c32ebdff], file_fullexename() function is supported windows, remove comment saying otherwize. (no code change) ... (check-in: 491b986d user: mgagnon tags: trunk)
Simplified an overly-clever test for a file size being an even multiple of 512 bytes. Compiler Explorer says GCC 11 generates the same code both ways, at least, and it isn't in a CPU-critical code path anyway. Also added a comment referring to this new, simplified code, to prevent a recurrence of the problem fixed by the prior commit. ... (check-in: c67d5401 user: wyoung tags: trunk)

Changes to src/db.c.

Changes to src/main.c.