Import series: add support for extracting catalog numbers

[php-coder]

Examples:
SC# 620-22
Sc 1395-1403
M# 726-729
Mi 1655-1663
Mi# 2646-49
Mi# Bl 235
M# Block 213
Mi. 1519-22
Заг № 938-946

Tech debt for 29f6dc9 (#660)

[php-coder]

After fixing #769 and #770 we also should support Zagorski and Solovyov catalogs.

[php-coder]

Support for Michel numbers will be added. All other catalogs will be addressed in the separate issues.

M# 726-729
Mi 1655-1663
Mi# 2646-49
Mi# Bl 235
M# Block 213
Mi. 1519-22

The first, very naive implementation only supports numbers in a form #726-729.