Drop fees by 10x due to the persistently higher exchange rate.

The last fee drop was by 5x (from 50k satoshis to 10k satoshis)
in the 0.8.2 release which was about 6 months ago.

The current fee is (assuming a $500 exchange rate) about 5 dollar
cents. The new fee after this patch is 0.5 cents.

Miners who prefer the higher fees are obviously still able to
use the command line flags to override this setting. Miners who
choose to create smaller blocks will select the highest-fee paying
transactions anyway.

This would hopefully be the last manual adjustment ever required
before floating fees become normal.
[Qt] add messages when handling local payment request files

- important for the open URI dialog to give users feedback
  when a file is invalid etc.
Don't create empty transactions when reading corrupted wallet

The current transaction loading code is not exception safe.
An exception during deserialization causes an empty transaction
to be left behind in the wallet.

Fix this by building the transaction separately and adding
it only to the wallet at the end.

Fixes #3333.
Win32: use a more modern API call in FileCommit()

- this seems to be a more recent API call and also supports e.g. SMB3,
  ReFS, which is not guaranteed for commit_()
- link to MSDN: http://msdn.microsoft.com/en-us/library/windows/desktop/aa364439%28v=vs.85%29.aspx
better std::exception logging for block/undo files
GUI: Fix design in overview page
[Qt] guard bitcoin-config.h and remove dublicated help message code
[Qt] don't regenerate autostart link on every client startup

- allows users to add additional paramaters via the autostart link
- related to #2197
Store orphan blocks in serialized form
[Qt] fix alphabetical ordering in Makefile.am

- also change to 1 file per line for more stuff in Makefile.am
Merge pull request #3507

9b146cd GUI: Fix design in overview page (Cozz Lovan)
Merge pull request #3511

245a6ab [Qt] guard bitcoin-config.h and remove dublicated help message code (Philip Kaufmann)
Merge pull request #3513

d464edf [Qt] fix alphabetical ordering in Makefile.am (Philip Kaufmann)
Tweak linearize.py to give more flexibility

Add the ability to start at a non-zero height, and allow for appending to
an existing file.
Merge pull request #3518 from Michagogo/linearize-start-value

Tweak linearize.py to give more flexibility
build: fix MacOSX build after ec41342

Fix regression introduced in ec41342.

Also use a less ugly solution, by defining the value of
`MOC_DEFS` in the configure script instead of `Makefile.include`.
Merge pull request #3524

67d60f7 build: fix MacOSX build after ec41342 (Wladimir J. van der Laan)
src/leveldb/Makefile is ignored?

remove the "-" in leveldb-* to include src/leveldb/Makefile
qt: use series of pngs for spinner

Use a series of .png frames for the spinner instead of a .mng.
`mng` is an obscure image format and is not built by default into Qt5.

This appears to improve the crispness of the spinner as well.

Does not noticably increase the size (still ~27k) and the code
is not more complicated either.
qt: Minor message updates

Used sending/receiving addresses -> Sending/receiving addresses
Previously requested payments -> Requested payments (idea from @cozz in #3521)