Merge branch 'fix--test-makefile-curdir' into 'master'

Tests: Add parent directory to Makefile TEXINPUTS

See merge request !19

tests/Makefile

@@ -8,7 +8,7 @@ XELATEX			?= xelatex
 LUALATEX		?= lualatex
 LATEX_FLAGS		?= -halt-on-error -interaction=nonstopmode
 
-export TEXINPUTS	:= $(CURDIR)/src//:$(TEXINPUTS)
+export TEXINPUTS	:= $(CURDIR)/../:$(CURDIR)/src//:$(TEXINPUTS)
 
 cmd%pdflatex		 = $(PDFLATEX) $(LATEX_FLAGS)
 cmd%xelatex		 = $(XELATEX) $(LATEX_FLAGS)