[Lazarus] Package cannot be installed

[Juha Manninen]

In fact there was no conversion to fix a unit's name until now.
I implemented it and now the package in issue #24545 converts and
installs without problems.

The char casing of a unit's name usually follows the file's name, or
the file's name is all lowercase. In both cases the files are always
found.
This was the first time I saw the char casing being different, but the
file not being lowercase.
Now it is fixed for all units, not only for units in packages.

Char casing was already fixed for unit names in uses section. That is
another thing.

See my note in issue :
  http://bugs.freepascal.org/view.php?id=24545
I don't believe the package was OK even in Delphi.
Now it converts and install well after you move the files into one directory.

The converter, and especially package conversion, was improved a lot.
Please test everybody.

Juha