Using symlinks in 'local-file'

[Alex Kost]

If one uses a relative symlink in 'local-file', it will lead to a broken
symlink in the store as illustrated in the attached example.  So I think
it either:

- should be documented explicitly that 'local-file' adds a specified
  file to the store blindly, which may lead to the problem with a broken
  symlink.

- or 'local-file' (or a deeper procedure) should take care of that case
  and dereference a symlink if needed.

WDYT?

local-file-sample.scm
Description: Lotus Screencam