Improve description how to turn off the caches

Closes: #753531
Do not clean "/" in pkgAcquire::Clean/pkgArchiveCleaner

Having "/" here is most likely a user configuration error and
may cause removal of import symlinks like /vmlinuz

Closes: #753531
po: Fill or add missing Language field
po: Remove fuzzy from file msgid header
po: Fill Project-Id-Version with correct project id and version
po: Fix Plural-Forms fields
po: Fix or add missing email addresses

Fill Report-Msgid-Bugs-To field, remove spurious email line junk and
make Last-Translator and Language-Team fields contain valid emails.
po: Fix encoding issues

Remove trailing CR characters, and fix Content-Transfer-Encoding field
value.
po: Fix format specifier order in translation
build: Set the XSL parameter through the command line instead of sed

Use the xsltproc --stringparam option instead of replacing it inside the
file.
build: Convert from DebianDoc SGML to DocBook XML
doc: Convert from DebianDoc SGML to DocBook XML
doc: Unfuzzy DocBook translations
Only show packages as upgradable if the have a CandidateVer != 0

Closes: #753297
prepare 1.0.6
releasing package apt version 1.0.6
add REAMDE.md
Merge remote-tracking branch 'mvo/feature/README' into debian/sid
StringToBool: only act if the entire string is consumed by strtol()

StringToBool uses strtol() internally to check if the argument is
a number. This function stops when it does not find any more numbers.
So a string like "0ad" (which is a valid packagename) is interpreted
as a "0". The code now checks that the entire string is consumed
not just a part of it. Thanks to Johannes Schauer for raising this
issue.
Update Japanese documentation translation

Closes: #754817