Do not try to load template from current dir by default.
Try to load templates from current dir only when it was explicitly
specified in template parameter: load for './template.tmpl', but not
load for 'template.tmpl'

Changes in variables names:
    template_abs_dir -> template_dir_abs
    template_abs_path -> template_path_abs
Merge branch 'bugfix_common_vars' into develop
Merge branch 'develop'