DEFPACKAGE has :IMPORT but not :IMPORT-FROM

[MattHeffron]

DEFPACKAGE can :IMPORT actual symbols into the package being defined, but if this is saved on a file in the package created, then the symbols may be written without the original package prefix, and may not specify the correct symbol.
If :IMPORT-FROM were implemented, from standard Common Lisp, then the correct package could be specified, and the symbol names be specified as strings. This would always be written back to the file unambiguously.

[rmkaplan]

This may or may not be related to older issues on packages that have to do with the fact that packages are not well-integrated into managed files and other aspects of the residential programming paradigm.

See #753 #474

(#477 is what the EDITINTERFACE PR #2301 addressed, probably can be closed)

[Anzus]

Coming in late on this since Matt has a PR already, but I see that it is implemented in the CLtL2 version, found in XCL-PACKAGE file. Ron is correct that the residential environment makes package stuff tricky.

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