Revert "keep.source in load_all"

This reverts commit 40d822986e081df6d33375d6bba9e988e31af11c.
The following fixes were applied to R/install-version.r and documented in NEWS:

- Archive.rds has moved from /src/contrib/Archive.rds to /src/contrib/Meta/archive.rds

- Fixed mix up of 'version' and 'package' in error message.

- There is no reason to convert the character vector 'version' (which is only used in this function) to the 'numeric_version' S3 class and for packages where the version number contain a hyphen this actually breaks the code.

- The package path is found in the row names of data frame info.