Merge branch 'jk/config-include'

* jk/config-include:
: An assignment to the include.path pseudo-variable causes the named file
: to be included in-place when Git looks up configuration variables.
config: add include directive
config: eliminate config_exclusive_filename
config: stop using config_exclusive_filename
config: provide a version of git_config with more options
config: teach git_config_rename_section a file argument
config: teach git_config_set_multivar_in_file a default path
config: copy the return value of prefix_filename
t1300: add missing &&-chaining
docs/api-config: minor clarifications
docs: add a basic description of the config API

diff --combined cache.h
index 422c5cfcb374259b46a7f92fc2a08b726f54f77a,8fdad9412d8fc7cd399b0c342a93ddb9f1a4672f..e12b15f4b92da906c50f7f51df95b126347e9441
--- 1/cache.h
--- 2/cache.h
+++ b/cache.h
@@@ -432,7 -432,6 +432,7 @@@ extern char *git_work_tree_cfg
  extern int is_inside_work_tree(void);
  extern int have_git_dir(void);
  extern const char *get_git_dir(void);
 +extern int is_git_directory(const char *path);
  extern char *get_object_directory(void);
  extern char *get_index_file(void);
  extern char *get_graft_file(void);
@@@ -1038,7 -1037,6 +1038,7 @@@ struct extra_have_objects 
  };
  extern struct ref **get_remote_heads(int in, struct ref **list, unsigned int flags, struct extra_have_objects *);
  extern int server_supports(const char *feature);
 +extern const char *parse_feature_request(const char *features, const char *feature);
  
  extern struct packed_git *parse_pack_index(unsigned char *sha1, const char *idx_path);
  
@@@ -1115,6 -1113,8 +1115,8 @@@ extern int git_config_from_file(config_
  extern void git_config_push_parameter(const char *text);
  extern int git_config_from_parameters(config_fn_t fn, void *data);
  extern int git_config(config_fn_t fn, void *);
+ extern int git_config_with_options(config_fn_t fn, void *,
+                                  const char *filename, int respect_includes);
  extern int git_config_early(config_fn_t fn, void *, const char *repo_config);
  extern int git_parse_ulong(const char *, unsigned long *);
  extern int git_config_int(const char *, const char *);
@@@ -1130,6 -1130,7 +1132,7 @@@ extern int git_config_parse_key(const c
  extern int git_config_set_multivar(const char *, const char *, const char *, int);
  extern int git_config_set_multivar_in_file(const char *, const char *, const char *, const char *, int);
  extern int git_config_rename_section(const char *, const char *);
+ extern int git_config_rename_section_in_file(const char *, const char *, const char *);
  extern const char *git_etc_gitconfig(void);
  extern int check_repository_format_version(const char *var, const char *value, void *cb);
  extern int git_env_bool(const char *, int);
@@@ -1140,7 -1141,13 +1143,13 @@@ extern const char *get_commit_output_en
  
  extern int git_config_parse_parameter(const char *, config_fn_t fn, void *data);
  
- extern const char *config_exclusive_filename;
+ struct config_include_data {
+       int depth;
+       config_fn_t fn;
+       void *data;
+ };
+ #define CONFIG_INCLUDE_INIT { 0 }
+ extern int git_config_include(const char *name, const char *value, void *data);
  
  #define MAX_GITNAME (1000)
  extern char git_default_email[MAX_GITNAME];
@@@ -1177,8 -1184,6 +1186,8 @@@ extern void setup_pager(void)
  extern const char *pager_program;
  extern int pager_in_use(void);
  extern int pager_use_color;
 +extern int term_columns(void);
 +extern int decimal_width(int);
  
  extern const char *editor_program;
  extern const char *askpass_program;