Donation Receipts 1.6 beta2

This release on tag 1.6-beta1 got revoked due to a regression described in #73, which is now fixed.

Release notes

New features

• [#12] Select currency - by @elcapo
• [#54] Provide "From e-mail" setting in profile - by @jensschuppe

Bugfixes

• [#56] "Back" button in Create form does not work - by @jensschuppe
• [#57] "Receipted" search column has no weight - by @jensschuppe
• [#58] DB Error: no such table - by @jensschuppe
• [#65] PHP 7.1/7.2 Compatibility - by @jensschuppe
• [#66] ArgumentCountError when calling CRM_Donrec_Logic_Receipt::createCopy() - by @thomst, @jensschuppe
• [#71] Wrong value for {$receipt.total} template variable in bulk receipt e-mail template - by @jensschuppe
• [#73] "Send via E-Mail" broken in 1.6-beta1 - by @systopia, @jensschuppe
• [#70] Cancel donation receipts is broken - by @Detsieber, @jensschuppe
• [#74] Error: Upgrade de.systopia.donrec to revision 0140 - by @systopia