Log Message:
Update gnucash to 2.6.10:

2.6.10 - 20 December 2015
Announcement: GnuCash 2.6.10 Release 2015-12-20
GnuCash 2.6.10 released

The GnuCash development team proudly announces GnuCash 2.6.10, the
tenth maintenance release in the 2.6-stable series.

The following bugs are fixed:
     Bug 627692 - Report options, Account Selection, "select all" \ 
=> not all
                  accounts selected, only visible ones
     Bug 646129 - Account selection in reports: 'Select Children' doesn't
                  actually select children if they are collapsed.
     Bug 662126 - Cannot create scheduled transaction for dividend reinvestment
     Bug 742321 - Reset temporary prefs on application startup
     Bug 745101 - No warning when quitting with unsaved file.
     	 	  When the file was first created without the New File Assistant.
     Bug 746155 - Reports: html-acct-table prepend-row! & prepend-col!
     	 	  unknown variables Fixed following the suggestions by
		  Tony Kerns.
     Bug 754192 - Since Last Run Dialog asks for security price even if not
                  needed.
     Bug 754533 -  No Account Templates Error Patch
     Bug 755781 - Files with copyright but no grant of license.
     Bug 756335 - When importing, date selection causes exit crash
     Bug 756339 - Prices table not updated
     Bug 756720 - configure fails to find libgoffice 0.10-10 (0.10.18-1)
     	 	  While we can't support libgoffice 0.10 because that would
		  require gtk3 we can improve the error message if no libgoffice
		  0.8.x version is found.
     Bug 757378 - Display the user-defined display symbol for non-currency
                  commodities.
     Bug 759224 - illegal dates in stock transactions cause corrupt file.
     Bug 759294 - New the billing term are not saved during invoice editing.
                  Prevent editing the terms from the invoice view.

Other repairs that weren't marked as bugs in git:
    Revert the automatic inversion of prices whose value is less than 1.0.
        This corrects several regressions from 2.6.8 and 2.6.9; it proved to
	be to big a change for a maintenance branch and will re-appear in the
	next major release.
    Fix test failure due to trying to parse nanoseconds, which we don't
        actually use.
    Use @SHELL@ instead of hardcode /bin/sh in test shell scripts.
        This is a workaround for MacOS X 10.11's System Integrity Protection.
    Improve the revert action: Ask user confirmation and don't ask to save
        before reverting
    Have a more generic mechanism to set Save action's sensitivity and use it
        for Revert action as well
    Avoid assert in gnc_split_register_balance_trans if default_account is null.
    Performance improvements in the Cash Flow report.
    Add new account chart for Duch small businesses.
    Add some developer documentation.

New Translations:
     Portugal Portuguese
Updated Translations:
     Arabic, German