[cosmetics] Fix typo in debug output

Found by Debian's automatic QA tool.
[cosmetics] Replace "misformed" by "malformed" in PO files

Found by Debian's automatic QA tool.
fix mishanding of LXVST (and windows VST) plugin names where the path includes a directory with a period/dot in its name such as ~/.lxvst
fix crash when deleting non-existing presets
move path_expand() and search_path_expand() into libpbd, and use them to expand search paths given to pathscanner objects (always)
add missing files
Fix guard name
fix other potential crashes with non-existing plugins and presets caused by indiscriminate use of vector_delete<T>
initial, prototype modifications to permit compilation of local libraries as static libs. required a "fix" to libs/pbd/debug.cc to even get the program up and running, and still does not work due to issues with boost::shared_ptr::enable_shared_from_this. controlled by configure-time --internal-{static,shared}-libs, set to shared by default (as has been the case for years)
make PBD::stacktrace() be clear if it cannot generate stacktraces for some (runtime) reason. not sure why this is an issue, but it is, right now, on my machine
remaining part of static library commit, should have been a part of 16ce39c2309769789784a1f74e41ce0c49a75282
fix an old bug introduced when cth tried (valiantly) to make region-list -> DnD -> canvas behave like a regular region drag. this doesnt' work because the RegionInsertDrag() grabs the mouse and breaks the DnD. in addition, the code failed to correctly indicate when a drop was possible (over a Track) and when it was not (over a Bus) - this has also been fixed. the actual code in Editor::drop_regions() could and should be simplified - no reason to use a RegionInsertDrag here, but it was fast
Merge branch 'patches' of https://github.com/jdekozak/ardour
fix nasty crash when using double-nested compound (consolidated) regions caused by not (re)allocating enough mixdown buffers; fix up various warnings from valgrind about mismatching operator delete[] by using shared_array<T> rather than shared_ptr<T>, as should have been the case all along
honor CTRL modifier when drag/drop importing files (copy vs embed)
change extraction of revision and build from revision.cc, and use in the build, package and uninstall scripts
make 0/KP_0 do the same thing in the mono panner as it does in the stereo panner (reset to center)
Merge branch 'master' of git.ardour.org:ardour/ardour
more tweaks to get package names right
more packaging name tweaks