Fix lock problem in concurrent download/extraction

docs: fix broken link about qli-installer

Signed-off-by: Hiroshi Miura <miurahr@linux.com>

Concurrency control with config file

User can control concurrency by customizing settings.ini file and give it by environment variable AQT_CONFIG

Improve redirection handling

PEP8

Signed-off-by: Hiroshi Miura <miurahr@linux.com>

Same as v0.7.6

Fix changelog syntax error

Signed-off-by: Hiroshi Miura <miurahr@linux.com>

Better mirror handling

Prepare for v0.7.6

Signed-off-by: Hiroshi Miura <miurahr@linux.com>

Fix document syntax error

Prepare for v0.8a3

- Fix changelog ReST syntax error.

Signed-off-by: Hiroshi Miura <miurahr@linux.com>

Better error and mirror handling

Prepare for v0.8a2

Signed-off-by: Hiroshi Miura <miurahr@linux.com>

Fix File-Not-Found error

• requirements to update py7zr version which has no more os.chdir() patch.

Refactoring threading installation logic

It changes an installation logic as simpler and more robust.

• No more os.chdir() (#97)
• Allow path search for 7z (#96)
• Use Popen for launching external 7zip command

Reduce slow down for extraction

• Deduce an issue to slow down reported as #86
• Limit py7zr version to v0.5.* that does not include a feature to extract password protected archives