tests/test-parentrevspec.out

verify: fix "missing revlog!" errors for revlog format v0 and add test

With revlog format v0 the .d files are empty if the only revision stored is an
empty file. Since Mercurial can no longer create format v0 repositories, but
still use it, add a script which creates a repository with a single empty file.
This can be used in other tests if wanted.

6:755d1e0d79e9 
5:9ce2ce29723a 3:a3e00c7dbf11 4:bb4475edb621 
4:bb4475edb621 1:5d953a1917d1 
3:a3e00c7dbf11 
2:befc7d89d081 
1:5d953a1917d1 
0:837088b6e1d9 

should work with tag/branch/node/rev
tip^: 5
default^: 5
755d1e0d79e9^: 5
6^: 5

some random lookups
6^^: 3
6^^^: 2
6^^^^: 1
6^^^^^: 0
6^^^^^^: -1
6^1: 5
6^2: abort: unknown revision '6^2'!
6^^2: 4
6^1^2: 4
6^^3: abort: unknown revision '6^^3'!
6~: abort: unknown revision '6~'!
6~1: 5
6~2: 3
6~3: 2
6~4: 1
6~5: 0
6~42: -1
6~1^2: 4
6~1^2~2: 0

with a tag "6^" pointing to rev 1
6^: 1
6^1: 5
6~1: 5
6^^: 3

with a tag "foo^bar" pointing to rev 2
foo^bar: 2
foo^bar^: abort: unknown revision 'foo^bar^'!