Unbreak wrapper script so that if a particular application is
specified but without specifying a document, that application is
started instead of presenting the user with the generic startup
window and requiring him to pick the document type (running
openoffice-*-scalc should open to a new spreadsheet, etc.)

Building with clang 3.7 is reported to have the same failure mode
as clang 3.6, so use the same optimization tweak as a workaround.

Various cleanups to do-install:

• The paths ${PREFIX}/${INSTALLATION_BASEDIR} and ${PREFIX}/${INSTALLATION_BASEDIR}/${AOODIR}, and ${PREFIX}/${INSTALLATION_BASEDIR}/${AOODIR}/share/xdg are frequently used, so create a few variables to hold those paths instead of repeating the same, long sequence in a number of places
• Tweak openoffice-wrapper to take advantage of the previous change
• Use INSTALLS_ICONS=yes instead of manually adding the @exec and @unexec entries to the plist
• Edit bootstraprc only once with ${REINPLACE_CMD} instead of running it twice to edit the same line
• Remove bootstraprc.bak so that it does not get installed
• With the advent of staging, it is not necessary to remove ${STAGEDIR}${DESKTOPDIR}/${EXECBASE}
• Simplify code for installing icons

Rename remaining OOO* variables to AOO*.