doc: Clarify wording about testing in README.md

Weaken and clarify the wording a bit, it currently implies that we get
more pull requests than we can ever handle which discourages
contribution.
[Qt] Fix Transaction details shows wrong To:
Limit number of known addresses per peer
Merge pull request #4218

4665b1a doc: Clarify wording about testing in README.md (Wladimir J. van der Laan)
Use pnode->nLastRecv as sync score directly

NodeSyncScore() should find the node which we recv data most recently, so put a negative sign to pnode->nLastRecv is indeed wrong.

Also change the return value type to int64_t.

Signed-off-by: Huang Le <4tarhl@gmail.com>
remove dup of extern int nConnectTimeout; in netbase
Merge pull request #4264

cb7a3ed remove dup of extern int nConnectTimeout; in netbase (Philip Kaufmann)
Merge pull request #4257

5823449 Limit number of known addresses per peer (Pieter Wuille)
Fix stray uppercase A in tx_valid.json.
Periodic language update

Pull updated translations from Transifex before 0.9.2
Make links on 'About Bitcoin Core' into clickable (squashed 5 comits into one)

Made the following links clickable:
http://www.opensource.org/licenses/mit-license.php
http://www.openssl.org/
eay@cryptsoft.com

(Squashed commits into one commit as suggested by @laanwj)

Replaced label with text browser on About Bitcoin Core Screen

So that the links on the About screen can be clickable

Replaced html property with text property

I have now removed unnecessary html so this should make life easier for
translators and you @Diapolo :). What do you think?

The size of the window needs to change

The size of the window needs to change when you make links clickable.
Thanks  for pointing that out @laanwj

Using the https://www.openssl.org over the http link

Using the https://www.openssl.org over the http link as suggested by
@Diapolo
Merge pull request #4268

223a6f7 Fix stray uppercase A in tx_valid.json. (Andreas Schildbach)
Merge pull request #4261

09a54a6 Use pnode->nLastRecv as sync score directly (Huang Le)
Merge pull request #4238

b90711c [Qt] Fix Transaction details shows wrong To: (Cozz Lovan)
Merge pull request #4213

516053c Make links on 'About Bitcoin Core' into clickable (squashed 5 comits into one) (Tawanda Kembo)