Encoding issues in variable labels

Fixes applied to the QOG Social Policy dataset:

la var ar_ue "Unemployment rate as % of civilian labour force, 1995-2002 (OECD, Kolodko 2000)."
la var dpi_dhondt "D'Hondt"
la var hu_ecr "Employers' contributions revenue"
la var hu_facr "State funds and other authorities' contributions revenue"
la var hu_wcr "Workers' contributions revenue"
la var iaep_lrit "Legislature's Ratification of International Treaties"
la var wvs_e040 "Hard work doesn't bring success"

TODO

• std
• bas